Lithium battery lower plastic structural member and welding protection device
By designing low plastic structural parts with high temperature resistance and stop functions, the problem of deformation of the plastic under lithium batteries during welding is solved, the product's high temperature resistance and assembly reliability are improved, and the safety and yield of the battery cell are enhanced.
Patent Information
- Application Number
- CN202421204606.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-05-29
AI Technical Summary
Plastic under lithium batteries is prone to deform during welding, affecting the insulation quality and hindering the assembly of the battery cell, increasing the difficulty of assembly.
A plastic structural part under the lithium battery is designed, using a composite structure of temperature-resistant materials and stop parts. The temperature-resistant parts include a temperature-resistant main body plate, connecting columns and connecting holes. The stop parts adopt a hollow design, and the temperature-resistant parts and stop parts are matched and fixed through mechanical connections.
The high temperature resistance and strength of the plastic is improved, and the deformation impact caused by welding is avoided, the difficulty of production process is reduced, and the product yield and the safety performance of the battery cell are improved.
Smart Images
Figure CN222813737U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium batteries, and in particular to a plastic structural part under a lithium battery and a welding protection device. Background Art
[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.
[0003] At present, new energy electric vehicles use large-capacity power batteries to provide energy. These power batteries can be repeatedly charged and discharged, among which lithium batteries are widely used due to their excellent performance. At present, lithium batteries usually include battery cells (or called winding cores), top cover plates and shells, etc. The battery cells are installed inside the shell, and the battery cells are connected to the electrodes (or called poles) on the top cover plates, and the top cover plates are welded to the top of the shell. The lithium battery cell structure is also provided with a lower plastic, which plays the role of insulating the shell / top cover plate from the battery cell, stabilizing the internal winding core (i.e., stopping effect) and assembling and positioning. At present, the lower plastic is usually injection molded with PP material. However, during the assembly process of lithium batteries, the lower plastic is easily affected by high temperature and deformed when the cover plate is laser welded, which affects its insulation quality, and is easy to hinder assembly when the battery cell is put into the shell, which requires high lithium battery assembly equipment and process capabilities. Utility Model Content
[0004] In view of the above-mentioned problems and defects existing in the prior art, the utility model provides a lower plastic structural part and a welding protection device for a lithium battery. By designing a locally high-temperature resistant lower plastic composite structure, when the cover plate is assembled and welded, the lower plastic can play a stopping role while having stronger high-temperature resistance and strength, avoiding the influence of deformation caused by welding, reducing the difficulty of the production process, and improving the product yield.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A lithium battery lower plastic structural member, embedded in the bottom of the lithium battery top cover plate, including matching temperature-resistant components and stop components;
[0007] The heat-resistant component is made of heat-resistant material in an integrated manner, and includes a heat-resistant main body plate, and heat-resistant connecting columns and heat-resistant connecting holes are symmetrically arranged on both sides of the heat-resistant main body plate;
[0008] The stopper component is made of an integrated plastic material and comprises two stopper main body plates of the same structure, and a stopper connecting hole and a stopper connecting column are provided on one side of the stopper main body plate;
[0009] The heat-resistant connecting column is embedded in the stop connecting hole, and the stop connecting column is embedded in the heat-resistant connecting hole.
[0010] According to a further technical solution, the temperature-resistant material includes ceramic, mica, PI, PEK, PFA and LCP.
[0011] According to a further technical solution, the stop body plate adopts a hollow design.
[0012] According to a further technical solution, guide grooves are provided on both sides of the interior of the heat-resistant main plate.
[0013] According to a further technical solution, a through hole is provided inside the heat-resistant main plate.
[0014] According to a further technical solution, the lower plastic structure is matched with the top cover plate, and the outer side of the lower plastic structure is in close contact with the bottom surface of the top cover plate.
[0015] According to a further technical solution, the temperature-resistant connecting column, the temperature-resistant connecting hole, the stop connecting hole and the stop connecting column can all be designed in any of a cylindrical, cubic and trapezoidal shape.
[0016] A welding protection device comprises the above-mentioned lower plastic structure of the lithium battery and a protection shell, wherein the lower plastic structure is embedded in the bottom of the top cover plate of the lithium battery, and the protection shell is tightly buckled on the lower plastic structure.
[0017] According to a further technical solution, a lithium battery core is placed in the protective shell, and the lithium battery core is welded in the protective shell.
[0018] According to a further technical solution, guide grooves are provided on both sides of the protective shell, and the guide grooves match and correspond to the guide grooves.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] 1. The utility model provides a lower plastic structural part of a lithium battery, and designs matching heat-resistant components and stop components. The design of the heat-resistant component can make the lower plastic have stronger high-temperature resistance and strength near the welding position, avoid the occurrence of melting, increase the safety performance of the battery cell, and improve the qualified rate of battery cell assembly. The stop component adopts a hollow design, which can ensure that the winding core inside the battery cell does not shake, and also provides a channel for gas circulation during typical gas production, ensuring the circulation of gas when the explosion-proof valve of the battery cell is opened, thereby improving the safety of the battery cell; through this local high-temperature resistant lower plastic composite structure design, when the cover plate is assembled and welded, the lower plastic can have stronger high-temperature resistance and strength while being stopped, avoiding the influence of deformation caused by welding, reducing the difficulty of the production process, and improving the product yield.
[0021] 2. The utility model also provides a lithium battery welding protection device, which adopts the proposed plastic structure under the lithium battery. It can ensure the stability of the battery cell during welding and avoid the deformation caused by welding. It can also avoid the influence of welding on other parts of the lithium battery top cover plate and other components, thereby improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0023] Figure 1 It is a schematic diagram of the lower plastic structural member in the utility model;
[0024] Figure 2 It is a side view of the lower plastic structural member and the top cover plate of the lithium battery in the utility model;
[0025] Figure 3 It is a structural schematic diagram of the plastic structural member under the lithium battery in the utility model;
[0026] Figure 4 It is a schematic diagram of the structure of the temperature-resistant component in the utility model;
[0027] Figure 5 It is a structural schematic diagram of the stopper component in the utility model;
[0028] Figure 6 It is a front view of the plastic structure of the lower lithium battery in the utility model;
[0029] Figure 7 It is a structural schematic diagram of the protective shell in the utility model.
[0030] Among them, 1. top cover plate; 2. protective shell; 101. lower plastic structure; 1011. temperature-resistant component; 1012. stop component; 10111. guide groove; 10112. temperature-resistant connecting column; 10113. temperature-resistant connecting hole; 10121. stop main body plate; 10122. stop connecting hole; 10123. stop connecting column. DETAILED DESCRIPTION
[0031] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0033] Embodiment 1
[0034] like Figure 1 and Figure 2 As shown, the utility model discloses a lower plastic structure of a lithium battery, wherein the lower plastic structure 101 is arranged at the lower part of the top cover plate 1 of the lithium battery and embedded in the bottom of the top cover plate of the lithium battery. Preferably, the lower plastic structure 101 is matched with the top cover plate 1, and the outer side of the lower plastic structure 101 is in close contact with the bottom surface of the top cover plate 1; Figure 3 As shown, the lower plastic structure 101 includes a matching temperature-resistant component 1011 and a stop component 1012; wherein, as Figure 4 As shown, the temperature-resistant component 1011 is made of an integrated temperature-resistant material and includes a temperature-resistant main body plate, and temperature-resistant connecting columns 10112 and temperature-resistant connecting holes 10113 are symmetrically arranged on both sides of the temperature-resistant main body plate; Figure 5 As shown, the stopper component 1012 is made of an integrated plastic material, and includes two parts of a stopper main body plate 10121 with the same structure, and one side of the stopper main body plate 10121 is provided with a stopper connection hole 10122 and a stopper connection column 10123. Further, the temperature-resistant connection column 10112 is embedded in the stopper connection hole 10122, and the stopper connection column 10123 is embedded in the temperature-resistant connection hole 10113, so as to achieve matching and fixing of the stopper component and the temperature-resistant component.
[0035] Specifically, the heat-resistant component is made of an integrated heat-resistant material, and the heat-resistant material includes but is not limited to ceramics, mica, PI (polyimide), PEK (polyether ketone), PFA (top-grade petalite) and LCP (fusible polytetrafluoroethylene). Considering that a large amount of heat will be generated during the welding process between the lithium battery core and the top cover plate, this will cause the local area of the lower plastic at the bottom of the top cover plate to melt, thereby affecting the sealing performance of the top cover plate, and the molten lower plastic interferes with the aluminum shell, affecting the assembly of the battery cell. Through the above-mentioned proposed heat-resistant component structural design, the lower plastic can have strong high temperature resistance and strength near the welding position, avoiding the occurrence of melting, increasing the safety performance of the battery cell, and improving the qualified rate of battery cell assembly. Preferably, in the heat-resistant component, a through hole is provided on the inside of the heat-resistant main plate to facilitate the pole to pass through the through hole from below, and the entire lower plastic structure is inserted into the lithium battery top cover plate.
[0036] Further, such as Figure 6 As shown, guide grooves 10111 are further provided on both sides inside the above-mentioned heat-resistant main body plate. During the helium inspection of the top cover plate, since the lower plastic is tightly attached to the bottom surface of the top cover plate, there is a situation where helium cannot pass through and the helium inspection structure fails. Through the design of this guide groove structure, a helium intake channel can be provided to improve the reliability of helium inspection. At the same time, the guide groove can provide a positioning and guiding function for the welding protection device during the welding of the top cover plate, so that the product has reliable positioning and guiding during high-speed mass production, thereby improving the portability of assembly.
[0037] Furthermore, the heat-resistant connecting columns and heat-resistant connecting holes symmetrically arranged on both sides of the heat-resistant main plate can be implemented by any design of a cylinder, a cube, a trapezoid, etc. This structural design can associate the heat-resistant component with the stop component, thereby solving the problem that the current lower plastic adopts one-piece injection molding and cannot combine different materials. The above design adopts a mechanical connection form, which can get rid of the material limitations and make high-temperature resistant materials used in key welding positions, and conventional materials used for the rest, effectively saving costs. At the same time, modular heat-resistant components can make the same pole design suitable for top cover plates of different sizes, which is conducive to the standardization of structural parts. For example, for top cover plates of different sizes, the same heat-resistant components can be used to match stop components of different sizes.
[0038] Specifically, the above-mentioned stop component includes a stop body plate, which adopts a hollow plastic design, can protect the winding core from shaking inside the battery cell, and at the same time provide a channel for gas flow during typical gas production, to ensure the flow of gas when the explosion-proof valve of the battery cell fails and opens, thereby improving the safety of the battery cell. Preferably, the interior of the two parts of the stop body plate can be an asymmetric structure, and the interior of the two parts of the stop body plate can adopt a variety of structural forms to achieve the stopping effect, such as Figure 6 As shown, the internal structures of the stopper main plates on the left and right sides are not completely consistent, but both can play a stopping role.
[0039] Furthermore, two stop main plates with the same structure are each provided with a stop connecting hole and a stop connecting column on one side. The stop connecting hole and the stop connecting column can be implemented by any design of a cylinder, a cube, a trapezoid, etc. The design adopts a mechanical connection to associate the heat-resistant component with the stop component, which can get rid of material limitations and make high-temperature resistant materials used at key welding positions, while conventional materials are used for the rest, effectively saving costs. At the same time, modular heat-resistant components can make the same pole design suitable for top cover plates of different sizes, which is conducive to the standardization of structural parts. For example, for top cover plates of different sizes, the same heat-resistant components can be used to match stop components of different sizes.
[0040] Embodiment 2
[0041] This embodiment provides a welding protection device, including the lower plastic structure of the lithium battery and the protective shell 2 provided in the first embodiment. Figure 7As shown, the lower plastic structure 101 is embedded in the lower part of the top cover plate 1 of the lithium battery, and the entire lower plastic structure can be inserted into the top cover plate of the lithium battery through the through hole on the heat-resistant main plate through the pole; the protective shell 2 is tightly buckled on the lower plastic structure 101, and the cross section of the protective shell 2 matches the cross section of the lower plastic structure, which can achieve a tight seal. In addition, guide grooves are provided on both sides of the protective shell 2. When the protective shell 2 is tightly buckled on the lower plastic structure 101, the guide grooves on the protective shell match and correspond to the guide grooves on both sides of the heat-resistant main plate, so as to achieve positioning and ensure the accurate position of the cap.
[0042] On this basis, the lithium battery core is placed in the protective shell 2, and the lithium battery core is welded in the protective shell, which can avoid the influence of welding on other parts of the top cover plate or other components, and ensure the effectiveness and qualified rate of the assembled lithium battery. In addition, the two sides of the protective shell 2 are connected to the ventilation pipe, and cooling gas is introduced through the ventilation pipe to cool the welding in the protective shell.
[0043] The specific working process of the utility model is as follows:
[0044] According to the size of the top cover plate, a matching stopper and a heat-resistant component are selected. After the stopper and the heat-resistant component are matched and connected, the entire lower plastic structure is embedded in the bottom surface of the top cover plate. As another embodiment, the entire lower plastic structure can be inserted into the lithium battery top cover plate by passing the pole through the through hole on the heat-resistant main body plate to further fix the lower plastic structure.
[0045] The protective shell is tightly buckled on the lower plastic structure, and the guide grooves on the protective shell match the guide grooves on both sides of the heat-resistant main plate; the lithium battery core is placed in the protective shell, and the lithium battery core is welded in the protective shell.
[0046] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. A lithium battery lower plastic structural member, embedded in the bottom of the lithium battery top cover plate, characterized in that: Including matching temperature-resistant parts and stop parts; The heat-resistant component is made of heat-resistant material in an integrated manner, and includes a heat-resistant main body plate, and heat-resistant connecting columns and heat-resistant connecting holes are symmetrically arranged on both sides of the heat-resistant main body plate; The stopper component is made of an integrated plastic material and comprises two stopper main body plates of the same structure, and a stopper connecting hole and a stopper connecting column are provided on one side of the stopper main body plate; The heat-resistant connecting column is embedded in the stop connecting hole, and the stop connecting column is embedded in the heat-resistant connecting hole.
2. The lower plastic structural member of a lithium battery as claimed in claim 1, characterized in that: The temperature-resistant material is any one of ceramics, mica, polyimide, polyetherketone, top-grade petalite and fusible polytetrafluoroethylene.
3. The lower plastic structural member of a lithium battery as claimed in claim 1, characterized in that: The stop body plate adopts a hollow design.
4. The lower plastic structural member of a lithium battery as claimed in claim 1, characterized in that: Guide grooves are arranged on both sides of the interior of the heat-resistant main body plate.
5. The lower plastic structural member of a lithium battery as claimed in claim 1, characterized in that: The heat-resistant main body plate is provided with a through hole therein.
6. The lower plastic structural member of a lithium battery as claimed in claim 1, characterized in that: The lower plastic structure is matched with the top cover plate, and the outer side of the lower plastic structure is in close contact with the bottom surface of the top cover plate.
7. The lower plastic structural member of a lithium battery as claimed in claim 1, characterized in that: The temperature-resistant connecting column, the temperature-resistant connecting hole, the stop connecting hole and the stop connecting column can all be designed in any of a cylindrical, cubic and trapezoidal shape.
8. A welding protection device, characterized in that: It comprises a lower plastic structure of a lithium battery and a protective shell as described in any one of claims 1 to 7, wherein the lower plastic structure is embedded in the bottom of a top cover plate of the lithium battery, and the protective shell is tightly buckled on the lower plastic structure.
9. The welding protection device according to claim 8, characterized in that: A lithium battery core is placed in the protective shell, and the lithium battery core is welded in the protective shell.
10. The welding protection device according to claim 8, characterized in that: The protection shell is provided with guide grooves on both sides, and the guide grooves match and correspond to the guide grooves.